I'd lke to add a bike computer for my new bike.Can somebody give me any suggestion?

Just watch a vedio in YOUTUBE: http://www.youtube.com/watch?v=0i_FZOAP9dg There are three kind of bike computers. It is hard for me to choose. Does anyone know about one of them? which one do you prefer to? Thanks for your help in advance.

If you use a mobile phone with an App it better work with the phone out of view or it will get snatched. You will also use a ot of batt power.
Wireless computers like the Cateye are fooled by the neww sensors for traffic lights, I have clocked 87mph! (Just check the "Max" display).
Garmin has one for about $130 I think, that uses GPS. The Edge 200. It will work in your pocket too.